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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
Is glass or metal a better conductor?
Glass has a higher conductivity than thin plastic but,it is still lower than metal so metal may be a better conductor
What has the ability to destroy entire cities and impair electronics?
A large enough body from space (comet, asteroid, meteor) that did not break up when coming through the Earth's atmosphere; a large sun flare or coronal blast; and a nuclear weapon detonation all have the ability to destroy entire cities and impair electronic communication systems.
What will happen if emitter base is reversed bias and collector base is forward bias?
If emitter-base is reverse biased then there will be no amplification effect on collector-emitter. If collector-base is forward biased, it will act like a diode, but without emitter-base current, that is meaningless.
What happens when resistance is varied in a circuit?
A resistor will not change its value, unless the voltage exceeds the designed power capacity of the resistor. As the voltage increases, the current will increase, if the current gets too high it will cause the temperature of the resistor to increase, if the temperature exceeds the power rating of the resistor then the resistance WILL change. If it goes too High in temperature the resistor will open and current will no longer flow. A resistor is used to control current, and indirectly the .voltage depending on the application. Hope This helps. You must use Ohms Law to see the relationship.
Define current gain of a common emitter configuration?
The voltage gain of a common emitter transitor amplifier is (inverted) collector resistor divided by emitter resistor, unless this would exceed hfe or the transistor is operating in non-linear mode.
What are the different types of splices for optical fibers?
1. Fusion splices: Use an arc to melt and connect two fibers.
2. Connectorised splices: Use various types of connectors like BNC, ST, etc. These can either be straight- or diagonal-cut fibers.
3. Epoxy splices: Here fibers are joined with the help of refractive index matching glue and guiding sleeves or jackets.
What is Ohm's law in a direct circuit?
Ohm's Law is a law of constant proportionality, and only applies to circuits in which the ratio of voltage to current is a constant over variations in applied voltage. Such circuits are called linear or ohmic circuits, and include most metals. However, in the case of metals such as tungsten, for electronic devices such as diodes, and for electrolytes, Ohm's Law does NOT apply, and we call such circuits 'non-linear' or 'non-ohmic'. For linear circuits, Ohm's Law simply states that the current flowing through that circuit is directly proportional to the voltage applied across its ends. The equation R = V/I is not, as many think, derived from Ohm's Law, but from the definition of the ohm.
What are Latest seminar topics on satellite communication related to IEEE?
Some of the topics for the similar on satellite communication related to IEEE are Intelligent mobile robot navigation technique using RFID Technology, Neural network based steam temperature control system, and GSM mobile phone based automobile security system. Some other topics are Smart card based Prepaid electricity system and Controlling a large data acquisition system using on industrial SCADA system.
Why does garage door remote close but not open garage door?
If the garage door opener worked ok the last time you used it, maybe the battery inside the remote has just gone flat and needs to be replaced? <><><> Also, make sure the two are compatible. If either one is new, you have to make sure they code the same (dip switch or rolling) and that they transmit on the same frequency. If they are not compatible, think about replacing the remote as changing the opener is much harder. Just figure out the two things mentioned earlier for your opener and find a remote that matches those. For further advice see web sites such as the Related Link below.
The voltage for 4 bulbs in a circuit?
The circuit voltage or the resistance of the individual bulb is needed to answer this question.
Divide the total power (400 W) by the supply voltage.
Why can silcon be used in computer circuits?
Atomic number of silicon is 14. So the electronic configuration is 2,8,4. So there are 4 electrons in outermost orbit. So to complete the octet, it has to get 4 electrons causing much electro negativity or to give 4 electrons causing much electro positivity. So it is reluctant to give electrons unless larger force is applied. So for the same reason carbon and germanium having 4 electrons in outer orbit are semiconductors of electricity. So when we add trivalent impurity (like aluminium ) to silicon it promote electrical conductivity and if we add pentavalent impurity ( like phosphorus) we get flow of electricity from trivalent plus silicon to pentavalent plus silicon. This is the basic principle used in electronics.
A cable tray is a rigid structure to support electric cables.
What is the advantage of triode?
With a diode tube you have no control over the current flow and it can only be used as a rectifier, where the triode consist of a control grid, to control the flow of electrons that will reach the anode, this make it possible to use the triode as a amplifier, compared to a transistor the control grid have the same function as the base of the transistor.
Advantages?
Over tetrodes and pentodes:
1. Operation at higher radio frequencies,
2. Lower noise figures,
3. Simpler circuitry and only one power supply.
What does a thermister do in a circuit?
A Thermistor Is essentially a variable resistor. The resistance of the thermistor changes with temperature. They're often used to regulate heating elements - like those found in cookers.
Let us look at a black box with two external terminals and the black box is composed of only passive elements.
Conservation of charge means that what goes in one terminal has to exit the other terminal, or else electrical charge will accumulate or deplete inside the black box.
Current is just charge per unit time. Current going in one terminal has to exit without loss the other terminal.
Resistors are passive element. In this situation, we have two black boxes, each is composed of one resistor. What goes in = what comes out --> the current is the same in both resistors.
What is bread board and how does it work in electronics?
A bread board is used to protect the bench top when cutting bread vegetables meat or other things in the kitchen.i.e you put the stuff you want to cut on the bread board not on the bench. Scientifically speaking, it is a board on which an electric circuit is made, usually as an experiment or prototype. See the link below.
How do you compare ttl logic and cmos logic?
The logic functions for both families of devices are the same. They differ only in their performance and other characteristics.
TTL stands for Transistor-Transistor Logic. Advantages include higher speed, better current handling and relative immunity to static discharge. Disadvantages include more power consumption, output high voltage drops and fixed supply voltages (typically 5 volts).
CMOS stands for Complimentary Metal Oxide Semiconductor. Advantages include better voltage output, better input voltage tolerance, variable supply voltages, higher density and much lower power consumption (although this increases with frequency). Disadvantages include sensitivity to static electricity and less current handling capability. Most new product development is in the CMOS family due to its more desirable characteristics.
TTL and CMOS families contain many "sub-families" designed with special characteristics for specific applications. For instance, some CMOS families can handle greater current, function at higher speeds or operate at much lower voltages. Texas Instruments has more than 40 families of products under CMOS and TTL.
What are the difference between semiconductors and semimetals?
A conductor is just that - something that conducts electric current. A semiconductor, however, is a material that can be and is used because by doing some things to it, we can cause its resistance to vary dramatically over a fairly wide range of values. We can cause it to conduct with little resistance, and we can cause it to resist current flow completely and prevent current from flowing. The material is a semiconductor, and it "sort of" conducts - either well or poorly or something in between, depending on how the device is made and on what we tell it to do. Conductor will pass electrons by the laws of electrical conductivity. Semiconductor will pass electrons basically only one way.
Conductors, like copper, are materials that simply conduct electricity from point A, such as the negative terminal of a battery, to point B.
Semiconductors are materials that conduct electricity from point A to point B, but have high high resistance. Many conductors can be modified to have unique properties when electricity is applied, such as in transistors. Put simply, semiconductors have an electrical conductivity somewhere between that of conductors (gold, copper) and insulators (wood, rubber).
A conductor allows an electric current to flow through it equally well in either direction. The amount of current which flows depends only on the amount of resistance of the conductor and on the amount of voltage applied across it. The direction of flow can always be considered as being from the positive to the negative pole of the source of the voltage applied, so the direction of flow through a conductor is always determined by which end of the conductor is connected to the positive pole of the source. A semiconductor allows an electric current to flow very strongly in one direction (this is known as the forward current) and very weakly in the opposite direction (which is known as the reverse current). The amounts of current which flow in each direction depend partly on the amount of the voltage applied but mainly on the forward resistance (which is relatively low) and the reverse resistance (which is always very high). So, unlike a conductor, the flow of current through a semiconductor is not the same amount of current whichever way the voltage is applied. The direction in which a semiconductor allows the forward current to flow depends on whether it is a p-type semiconductor or an n-type semiconductor. How are semiconductors made? Certain elements, such as Germanium or Silicon, are not naturally semiconductors but can be made into semiconductors by melting them and adding very small amounts of other chemicals. This process is called doping. Whether a p-type semiconductor or an n-type semiconductor is produced depends on the type of doping chemical used.
What are causes of voltage drop?
Think of it in terms of a central heating system that uses a number of radiators: the water pump applies pressure across all the radiators. But there must also be a pressure difference across the inlet and outlet to each radiator, or water wouldn't flow through the individual radiators. The sum of these pressure differences will equal the pressure delivered across the entire system by the pump.
Now imagine a number of resistances connected in series. There must be individual potential differences across each resistance or current wouldn't flow through them. We call these individual potential differences, 'voltage drops', and the sum of the voltage drops across each resistance will equal the magnitude of supply voltage, but act in the opposite sense.
What is DC load line of a transistor?
A: A transistor has voltage gain as base current is allow to flow. If the load is constant then a DC mirror azimuth path can be plotted as a function of base current and collector current and that is the load line
Do transformer works on pulsating dc?
If the input is pulsating DC, then the output will be pulsating DC. It will not be shaped the same, but it will be close, depending on the frequency and rise and fall time in comparison with the inductive reactance of the transformer.
